Method for detecting oil and gas by aid of stacked seismic data

A seismic data, oil and gas detection technology, applied in the direction of seismic signal processing, etc., can solve the problems of low reliability, poor adaptability, insufficient stability, etc., and achieve the effect of enhancing identification ability and improving sensitivity

Active Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] The present invention aims to overcome the problems of low reliability, poor adaptability, and insufficient stability in the

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  • Method for detecting oil and gas by aid of stacked seismic data
  • Method for detecting oil and gas by aid of stacked seismic data
  • Method for detecting oil and gas by aid of stacked seismic data

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Embodiment Construction

[0031] The following is an example of the detection of oil and gas in Pu 138 work area, Dongpu Sag, Bohai Bay Basin, China, and the present invention will be described in detail in conjunction with the accompanying drawings. Depend on figure 1 As can be seen, the present invention comprises the following steps:

[0032] 1. Data preparation: Obtain the seismic post-stack pure wave data of the work area, the coordinates of each well location in the work area, the thickness of the oil and gas-bearing layer of each well target interval, and the interpreted top and bottom time data of the target layer, figure 2 It shows a seismic profile marked with the location of well p138-7 and the bottom interface layers of Es3z1, Es3z2, Es3z3, and Es3z4. The time sampling rate of post-stack seismic pure wave data is 2ms, and the number of time sampling points is 2000; Table 1 shows that p138 -2, p138-3 and p138-7 wells Es3z2 and Es3z3 layer oil and gas thickness data.

[0033] Table 1 Stati...

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Abstract

The invention relates to a method for detecting oil and gas by the aid of stacked seismic data. The method includes analyzing frequency spectra of objective intervals of seismic traces beside wells and determining parameters of sliding time windows; dividing high-frequency and low-frequency portions of the frequency spectra by the aid of weighted average frequencies, and solving frequency spectral energy of the low-frequency portions by the aid of a reverse frequency weighting process; acquiring energy coefficients by the aid of ratios of the energy of the low-frequency portions to energy of the high-frequency portions of the frequency spectra; creating seismic wave attenuation factors for indicating the oil and gas containing probabilities of strata by the aid of the energy coefficients and weighting frequencies; acquiring data volumes of the seismic wave attenuation factors of work areas and identifying beneficial oil and gas containing work areas in the work areas. The method has the advantages that low-frequency enhancement and high-frequency attenuation information in the frequency spectra of the seismic data can be sufficiently extracted and utilized, accordingly, the method is favorable for highlighting existence of oil and gas layers, the oil and gas layer identification ability can be enhanced, and the oil and gas detection sensitivity can be improved.

Description

technical field [0001] The invention relates to a method for detecting oil and gas by using post-stack seismic data, and belongs to the technical field of oil and gas prediction in seismic exploration reservoirs. Background technique [0002] Post-stack seismic data not only carry kinematic information related to the shape of underground geological structures (such as reflector shape, travel time, etc.), but also contain a large amount of dynamic information related to the properties of underground rock formations. As the main object of seismic exploration turns to the field of lithologic oil and gas reservoirs, people expect to obtain information about lithology and oil and gas of the target interval through the amplitude, frequency and other attributes of post-stack seismic data. [0003] In the 1960s and 1970s, oil and gas detection technology based on seismic amplitude characteristics appeared, and this type of technology was mainly used in the prediction of oil and gas ...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 秦广胜蔡其新姜贻伟苏云张红霖晋达汪露露常正时
Owner CHINA PETROLEUM & CHEM CORP
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